Senior .NET Software Engineer

About the role

Commit builds software products for clients across embedded, IoT, SaaS, AI/ML, e-commerce, mobile, and web. We’re looking for a Senior .NET Backend Engineer to join a strong, high-bar team building high-performance, secure .NET services. You’ll be a hands-on contributor — designing and writing production backend code, shaping technical decisions alongside your teammates, and delivering for clients (including large enterprise and banking environments).

What you’ll do

• Design and build robust, high-performance, secure backend services in C# / .NET.

• Contribute to backend architecture and technical decisions alongside the team.

• Design and document APIs (Swagger / OpenAPI) for clean, well-versioned integrations.

• Take part in code reviews and help uphold the team’s engineering standards.

• Drive performance, reliability, and secure-by-design practices in your code.

• Contribute to build, packaging, and deployment so releases are repeatable and reliable.

Requirements:

Must-have qualifications

• 5+ years in backend engineering.

• 1+ years experience in AI Tools Claude Code, Copilot, Cursor

• Expert-level command of the core .NET stack: C#, .NET / .NET Core, ASP.NET Core, Entity Framework, LINQ, and async/concurrent programming.

• Strong networking fundamentals (TCP/IP, HTTP/S, sockets) and API/service communication.

• Proven performance-engineering skills: profiling, optimization, and advanced debugging of complex systems.

• Strong background in secure code writing (OWASP, secure SDLC, common vulnerability classes and mitigations).

• Experience with API design and documentation using Swagger / OpenAPI (e.g. Swashbuckle).

• Software packaging and deployment experience (NuGet, containers/Docker, CI-driven artifacts, installers).

• Fluent with modern dev tooling: Git, JIRA, Jenkins.

• Professional-level English.

• Excellent interpersonal and communication skills.

Nice to have

• Cloud experience (Azure / AWS) and microservices or messaging (e.g. gRPC, RabbitMQ, Kafka).

• Experience with AI-first development (Claude Code, Cursor).

• Additional programming languages and frameworks.

• Experience working in large organizations (e.g. banking / financial services).